Clearing Codes
WARNING: This page is about a different car, the 1995 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
To clear codes from PCM memory when using MIL (CHECK ENGINE light), disconnect jumper wire and reconnect harness connectors. If using scan tester, follow tool manufacturer's instructions. If problem has not been corrected or fault is still present, code will immediately be reset in PCM memory.